How to disable typescript transpire in ionic 3

Hello,

I am migrating and old ionic 2 app to ionic 3. For some reason, the developer who build the app was using js instead of typescript so there is no single .ts file in my repo. When i run ionic serve (ionic 3), i got this error:
[14:43:17] watch started …
[14:43:17] build dev started …
[14:43:17] typescript error
No inputs were found in config file ‘D:\Fleetcor\repos3\onroad-mobile-app_node12_2\onroadApp\tsconfig.json’.
Specified ‘include’ paths were ‘[“src//*.ts"]’ and ‘exclude’ paths were
'[“node_modules”,"src/
/.spec.ts","src/**/tests/.ts”]’.

TypeError: Cannot read property ‘replace’ of null
at Object.escapeHtml (D:\Fleetcor\repos3\onroad-mobile-app_node12_2\onroadApp\node_modules@ionic\app-scripts\dist\util\helpers.js:253:10)
at generateCodeBlock (D:\Fleetcor\repos3\onroad-mobile-app_node12_2\onroadApp\node_modules@ionic\app-scripts\dist\logger\logger-diagnostics.js:187:77)
at generateDiagnosticHtml (D:\Fleetcor\repos3\onroad-mobile-app_node12_2\onroadApp\node_modules@ionic\app-scripts\dist\logger\logger-diagnostics.js:179:12)
at Array.map ()
at Object.printDiagnostics (D:\Fleetcor\repos3\onroad-mobile-app_node12_2\onroadApp\node_modules@ionic\app-scripts\dist\logger\logger-diagnostics.js:15:39)
at getTsConfig (D:\Fleetcor\repos3\onroad-mobile-app_node12_2\onroadApp\node_modules@ionic\app-scripts\dist\transpile.js:322:34)
at Object. (D:\Fleetcor\repos3\onroad-mobile-app_node12_2\onroadApp\node_modules@ionic\app-scripts\dist\transpile.js:298:46)
at step (D:\Fleetcor\repos3\onroad-mobile-app_node12_2\onroadApp\node_modules@ionic\app-scripts\dist\transpile.js:32:23)
at Object.next (D:\Fleetcor\repos3\onroad-mobile-app_node12_2\onroadApp\node_modules@ionic\app-scripts\dist\transpile.js:13:53)
at D:\Fleetcor\repos3\onroad-mobile-app_node12_2\onroadApp\node_modules@ionic\app-scripts\dist\transpile.js:7:u7121:

I think the root cause is that the transpire.js is looking for a ts file and it found nothing the the exception get logged but the logger is also expect the error in typescript format. Is there a way to disable the typescript transpire process?